Low copper status affects younger tissue, particularly active growing points of shoot, root, flower and fruit. Plants display slow growth, poor or irregular expansion of tissue, with distinct bleach margins to active growing points.
Copper deficiency reduces structural integrity, affecting stem strength, leaf expansion and the movement of proteins, carbohydrates and soluble nutrition. This results in poor canopy and root development, affecting flowering, seed and fruit set. Low manganese status is often associated increased disease pressure and is worse on alkaline soils and in cold, wet growing conditions.
Check soil status and root development for compaction. Routine foliar treatment can be very effective, especially during the early stages of plant development and times of stress.